I do track my cycle, I typically ovulate 2 or 3 days after my period ends and this happened 7 days after my period ended. I'm on paragard but I know that no birth control is 100%. I'm not sure with my others when I conceived.

By tracking your cycle maybe? If you know when you ovulate you could make your determination based on that. Do you track your cycle? I know i ovulate in the 1to 3 days after the end of my period bc each time I've been pregnant it was from sex during that time. Thinking back is it that way for you? In your other pregnancies when did you conceive?

You can’t really unless you really know your body. At least for me